As a critical safety component in modern industrial automation, the M35 Series addresses the fundamental safety requirement mandated by ISO 13849-1 and ISO 13118:2000 standards: the complete dissipation of pneumatic energy to prevent unintended startup or movement. This comprehensive catalog provides engineers, safety managers, and machine designers with complete technical specifications, configuration options, and integration guidance necessary for implementing reliable pneumatic safety systems.  

Key Features and Safety Certifications

Highest Safety Integrity Ratings

The M35 Series achieves the industry's most stringent safety certifications, including Category 4, Performance Level e (PL e) per ISO 13849-1:2015, Safety Integrity Level 3 (SIL 3) per IEC 62061:2001, and DGUV functional safety certification. These ratings confirm that when properly integrated with appropriate safety controls, the M35 Series provides control reliable operation suitable for high-risk applications requiring maximum risk reduction.    

Redundant Dual Poppet Design

At the heart of the M35 Series is ROSS's patented cross-flow technology featuring dual poppet valve elements that operate synchronously. This redundant architecture ensures that even in the event of a single valve element failure, the system maintains its safety function by automatically exhausting to atmosphere. The poppet design offers significant advantages over traditional spool valves, including superior dirt tolerance, wear compensation for extended service life, quick response times, and high flow capacity without requiring in-line lubrication.    

External Monitoring with 99% Diagnostic Coverage

Each valve element incorporates a solid-state PNP pressure sensor that enables external monitoring systems to verify proper valve operation. By monitoring both sensors during each actuation and de-actuation cycle, the system achieves up to 99% diagnostic coverage, detecting malfunctions before they compromise safety. When a fault is detected—such as one valve element remaining open while the other closes—the monitoring system can immediately shut down power to prevent hazardous conditions.   

Rapid Exhaust Performance

The M35 Series features parallel exhaust paths that provide industry-leading exhaust flow rates, ensuring rapid depressurization even during faulted conditions. This high exhaust capacity is critical for quickly bringing machinery to a safe state during emergency stop situations or when personnel access guarded areas.   

Technical Specifications and Performance Data

Operating Parameters

The M35 Series operates across a broad pressure range of 30 to 150 psig (2 to 10 bar) with ambient temperatures from 40° to 120°F (4° to 50°C) and media temperatures up to 175°F (80°C). The valves function as 3/2 normally closed, dual poppet designs with solenoid pilot control and air-assisted spring return, requiring both solenoids to operate synchronously. 

Electrical Specifications

Operating on 24 VDC with 2.0 watts power consumption per solenoid, the M35 Series features continuous duty rating and IP 65 enclosure protection per IEC 60529. Electrical connections utilize two 5-pin M12 connectors for solenoids and sensors, with multiple pin configuration options available to suit various control architectures. 

Functional Safety Data

The valves demonstrate exceptional reliability with a B10D value of 25,000,000 cycles, PFHD of 7.71×10⁻⁹, and MTTFd of 301.9 years (based on 662,400 operations). These figures confirm the valve's suitability for safety-critical applications requiring minimal probability of dangerous failure.  

Flow Capacity and Construction

Available in 1/2″ and 3/4″ port sizes with NPT or G thread options, the M35 Series delivers flow rates of 4.1 to 4.3 Cv (4,000 to 4,200 Nl/min) for supply paths and 7.6 Cv (7,400 Nl/min) for exhaust. The cast aluminum valve body houses acetal and stainless steel poppets with Buna-N seals and PTFE backup piston rings for enhanced durability.  

Available Configurations and Ordering Options

Soft-Start EEZ-ON® Module

The M35 Series is available with or without the optional Soft-Start EEZ-ON® module. When included, this feature allows outlet pressure to increase gradually until reaching approximately 50% of inlet pressure, then opens fully to complete system pressurization at full rate. This controlled pressure build-up helps protect sensitive equipment and extends component life in applications where sudden pressure application could cause damage. 

Exhaust Options

Customers can choose between valves with built-in silencers for direct exhaust or models with threaded exhaust flanges for remote exhaust routing. Both configurations provide equivalent exhaust performance while accommodating different installation requirements and noise control strategies. 

Monitoring and Feedback Devices

Beyond the standard pressure sensors, the M35 Series can be configured with optional analog pressure gauges or digital pressure transducers providing 4-20mA output for continuous process monitoring. Additional accessories include redundant pressure switch assemblies for energy release verification and prewired electrical connector kits to simplify installation. 

Industry Applications and Use Cases

Manufacturing and Assembly Operations

The M35 Series finds extensive application in automated manufacturing cells where pneumatic actuators power material handling, assembly operations, and testing equipment. By providing reliable safe exhaust functionality, these valves enable compliance with machine safety standards while minimizing downtime through their high diagnostic coverage and long service life.    

Packaging and Material Handling

In high-speed packaging lines and material handling systems, the M35 Series ensures personnel safety during changeovers, maintenance access, and emergency stop conditions. The rapid exhaust capability minimizes machine stopping distances, reducing the risk of injury from moving components.    

Metal Forming and Press Applications

While the M35 Series is specifically designed for safe exhaust applications and not intended for controlling clutch/brake mechanisms on mechanical power presses (the DM2® Series D is recommended for those applications), it serves critical safety functions in press auxiliary systems and material handling zones.  

General Industrial Machinery

Across diverse industries including automotive, food processing, pharmaceuticals, and consumer goods manufacturing, the M35 Series provides essential pneumatic safety where Category 4, PL e protection is required by risk assessment.   

Integration Guide and Monitoring Requirements

External Monitoring System Requirements

The M35 Series requires integration with a safety-rated control system capable of dynamic, cyclical monitoring of both valve pressure sensors. This can be accomplished through three architectures: a safe PLC offering the highest functionality and independent processors for redundant channel management; a programmable safety relay providing Cat 4, PL e capability at moderate cost; or a standard PLC with safety relay achieving Cat 3, PL d rating.   

Validation and Testing Protocols

Proper integration requires monitoring both pressure sensor states with any changes in valve control signals to detect faults before the next safety demand. The valve should undergo minimum operational frequency testing at least once per month to ensure proper function. ROSS provides a comprehensive Integration Guide detailing operation procedures, monitoring logic, and validation test procedures.  

Modular Air Entry System Integration

The M35 Series features both modular receptacles and female threaded ports, allowing either modular connection to ROSS MD Series filter-regulator-lubricator (FRL) units or direct piping as installation requirements dictate. Mounting accessories including brackets, clamps, port blocks, and end ports facilitate system assembly. 

System Design Considerations

When implementing the M35 Series, engineers must ensure unobstructed air flow in supply lines and avoid exhaust port restrictions that could adversely affect valve operation. Exhaust silencers must have flow capacities at least equal to valve exhaust capacity and resistance to clogging. Proper filtration using 5-micron rated filters and compressed air meeting ISO 8573-1 Class 7:4:4 standards optimizes valve performance and longevity. 

Download the Complete Catalog

This comprehensive 24-page PDF catalog provides detailed dimensional drawings, exhaust time data for various volumes and pressures, complete model number configurators, valve connector pinouts, electrical specifications, accessories catalog, and mounting instructions. Engineers and specifiers will find all the technical information necessary to select, specify, and integrate M35 Series Safe Exhaust Double Valves into their pneumatic safety systems. 

What's Included:

• Complete product overview and safety function description
• Detailed technical specifications and operating conditions
• Safety certification data and functional safety parameters
• Model number configuration guide with all available options
• Dimensional drawings and CAD model information
• Valve operation principles and fault detection methodology
• Exhaust time performance data for normal and faulted conditions
• Comprehensive accessories catalog including gauges, transducers, silencers, and connectors
• Integration recommendations and safety guidelines
• Global contact information for ROSS Controls locations

For engineers committed to implementing the highest levels of pneumatic safety in accordance with international safety standards, the ROSS M35 Series Safe Exhaust Double Valves catalog serves as an essential technical resource.   

Related Resources:

• M35 Series Integration Guide
• SISTEMA Safety Calculation Library (downloadable)
• ROSS Safety Function Selection Guide
• Pneumatic Safety Standards Compliance Overview

For technical support, product selection assistance, or custom ROSS/FLEX® solutions, contact ROSS Controls at +1-248-764-1800 or visit www.rosscontrols.com.